Chimney Maintenance

Q. I have a gas burner/boiler and stainless steel chimney liner. Does that need to be cleaned by a chimney sweep? Additionally, the steel exterior door to my cellar entry is rusting. Suggestions?

A. Burning gas produces nothing but water vapor (the fumes are toxic), so I don’t think there is a need to clean it. An occasional inspection would help. For your other issue, get a steel bulkhead and door that is secure, and with powder coat to avoid rusting.